Steam-boiler



(No Model) J. PIERPOINT. STEAM BOILER.

No. 548,455. Patented 051;. 22, 1895.

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UNrrnD STATES PATENT @rrrcn.

JAMES PIERPOIN'I, OF PITTSBURG, PENNSYLVANIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 548,455, dated October22, 1895.

3 Application filed October 31, 189 Serial. No. 27, (N0 m de To all whomit may concern:

Be it known that 1, JAMES PIER-POINT, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Steam-Boilers, of which the following isa full, clear,and exact description, reference being had to the accompanying drawing,forming part of this specification, in which the figureis a verticallongitudinal section of my improved boiler.

My invention relates to vertical water-tube boilers, and is designed tosimplify, cheapen, and improve their construction.

To that end it consists in an upper steam and water drum, a lowermud-drum, a bank of tubes connecting these drums, and a partition-walllocated between the tubes of the bank and arranged to cause anup-and-down pass of the furnace-gases over the tubes and by keepingcertain of the tubes in a cooler place insure a strong circulation andefficient abstraction of heat.

In the drawing, 2 represents the upper steam and water drum, 3 themud-drum, and at the bank of tubes connecting the same. Between thecentral rowsof this bank is placed the transverse fire-brick partition5, which extends from the mud-drum upwardly to a point near the steamand water drum.

6 is the furnace, from whence the gases pass upwardly among the frontrows of the bank, then descend among the rear rows, and thence ascendthrough the outlet-flue 7. Deflectingplates 8 are employed to hold thegases in contact with the tubes, thus insuring the ab-' straction ofheat thereby.

In the steam and water drum I provide a vertical longitudinalbattle-plate 9, which is preferably bolted to the inside of the shell byangle-irons 10 at the ends and extends upwardly to a point above thewater-level. This plate extends between the tube ends, and thefeed-water entering through the pipe 11 on the left-hand side of theplate is prevented thereby from mingling with the hotter water risingthrough the tubes nearer the furnace, but descends through the rear rowsin a less violent manner than in the main circuit, from which it iscutoff by the baffle-plate, thereby giving a much better deposition ofsediment.

The heat of the gases is fully extracted on account of the lowertemperature of the rear tubes down which the feed -water passes, while aviolent circulation takes place between the front rows and these rearrows, which are not cut ofi by the battle-plate.

The advantages of the invention are appar out, the arrangement of theparts being simple, compact, and highly effective.

I claim- I. Awater-tube boiler comprising an upper transverse steam andwater drum, a lower mud drum, a series of substantially parallel tubesconnecting these drums, a vertical transverse partition between thetubes, and deflecting plates arranged to hold the gases among the tubes;substantially as described.

2. A water-tube boiler comprising an upper transverse steam and waterdrum provided with a vertical battle-plate extending to the bottom ofthe drum, a lower mud drum, tubes connecting these drums, and a verticaltransverse partition between the tubes; substantially as described.

3. A water-tube boiler comprising an upper transverse steam and waterdrum provided with a Vertical bathe-plate extending above the waterlevel and a feed pipe entering on one side of the plate, a lower muddrum, tubes connecting these drums, and avertical transverse partitionbetween the tubes; substantially as described.

In testimony whereof I have hereunto set my hand.

JAMES PIERPOINT.

Witnesses:

H. M. ConWIN, O. BYRNES.

